Siemens siprotec 7SA522 - Frequency Protection (Optional)

4 Technical Data
474
7SA522 Manual
C53000-G1176-C155-3
4.16 Frequency Protection (optional)
Frequency Elements
Pickup Values
Times
Dropout Frequency
Operating Ranges
Tolerances
Quantity 4, depending on setting effective on f< or f>
f> or f< adjustable for each element
For f
N
= 50 Hz 45.50 Hz to 54.50 Hz Increments 0.01 Hz
For f
N
= 60 Hz 55.50 Hz to 64.50 Hz Increments 0.01 Hz
Pickup times f>, f< Approx. 85 ms
Dropout times f>, f< Approx. 80 ms
Delay times T 0.00 s to 600.00 s Increments 0.01 s
The set times are pure delay times.
Note on drop-off times:
Drop-off was enforced by current = 0 A and voltage = 0 V.
Enforcing the drop-off by means of a frequency change below the drop-off threshold extends the drop-off times.
∆f = | pickup value – dropout value | Approx. 20 mHz
In voltage range Approx. 6 V to 230 V (phase-earth)
In frequency range 25 Hz to 70 Hz
Frequencies f>, f< in specific range (f
N
± 10 %) 15 mHz in range U
LE
: 29 to 230 V
Time delays T(f<, f>) 1 % of setting value or 10 ms